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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599fc9f88230f4c2e4ed92e770352fe0d9a5c1f2234ad2cacf303fbee6119823' 
  AND token = '0JI4zVA8+0XRL3R58kZgmLkRHERCPHSUzd5q1FvUnDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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