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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea46e10ea572b39b7fc1aa8cbb64713a1c2a6f7b1a7d4c32c3bcf31687a6cad' 
  AND token = 'NcptbsXw4yUcJPnuvj0mGopCdVaaTB6CGBLy8Rs1zU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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