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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf5931d17c6fb09336cd251422d9831b25a346f3d9f4c2853c48160149664ce' 
  AND token = 'Zowf4CwN8tiYy4g1mNUDMXH+RPns8wA6nnXVA6zNoi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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