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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08c23c196621f6714ed108dfe7ee629c94cc9d7593882ec50acb0b4c2cb3e9f' 
  AND token = 'STTg1H+C4dEZFdk+Uq8A5yxczRV7UUObOwKVYnIaQk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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