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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb40f33cf2f2338fb6e19c7452e542465915da6b081865b60f156de527fc933d' 
  AND token = 'aNZ6oU6yOoy4k7JOYEdG5/MLX4O8EjoOTVpocu5BFsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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