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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9f5a7f9dce37c2400e05f1e9fba364a73f2c7f6146bb3d37c8c0286ca20f87' 
  AND token = '1eB/3Peg6zPTPeyyuTLSQkCqWDHLpf85NLvJt0ivnA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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