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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6352a4391725d16a2e9760dd02134fed804f63821a801f2e095a0ffce70ef2a' 
  AND token = 'zKY2Dj11+BVcpP2/JRDAcyUKHEGY2EOTLVwVOO+nBE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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