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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78635772bd79d62e39ce558caf6b54b14e6537bab43a959ca71c9ea8574a7e1c' 
  AND token = '5wJfGyH8Dv2MVK6XTWVGEt8vB2HevBrs57wyxuBcmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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