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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fade749ce3b4d1cc00c143d00f87b14e90cd257a65c8d3d0039777effd6486' 
  AND token = 'kqisoiV8RQ/by8RDPMKGsTBWCfLc9M5HIwC7Zis3nEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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