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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447f0e1f42f7c4ed2f5b16464a7b5050fb280d4f13b872866ae465302546923b' 
  AND token = 'YlpjDdXZeOlIY1wF2wdrUEZGXVtkXrQBhf3l37gkAek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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