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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4733aea0971951d346005e50e8f915fe16725a20e217dbef2c1e38e0c4b10f60' 
  AND token = '7o/0CkBRqICbqde1QNS0Ny/SWg+Lgjy4sRk2TLUkymc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}