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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b743e693ace9fb6cae7824b43d1df4ea1915ea455ccf2e5e741caaa655a61e0' 
  AND token = '8WgUY7UMUfBUeYWD8P/iZWrWFoveQX3Zony6HnRajw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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