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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559411d7b70014bda7cca8a0994fb943b208f2b199257b834c025687e2f852d6' 
  AND token = '8pPxoIKHaH5EQP5C15eEIdCmE3H8p4mx4VfAJqWcroo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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