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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eb553414b3b59f25458d48bc6cca71e2fc911a96552b6bf5ab0a2f8b0558e6' 
  AND token = 'jhsszBCHai80WhXvup4u9ShIe6bpjOCUofaQ/B7ugB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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