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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd252f29984ac0cbb27c3e70a60064ad1284ce7d182866ea595f5ebdbba72a1f' 
  AND token = 'TAMuAg6M/GUoMbnCOvc8Y/xJbfnI5J4osMmeRs0uxXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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