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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fa807c89166aa23137d3278b3e3d46e36361c97df9feec6859ce14d485145e' 
  AND token = '6xhGg0m7Lfu7vUNGXRuZ7jDz6ddb8G6XcCItPYDyv1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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