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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de1252ca7215913ef4e0b29fe067136c348bb3fe95a444dc1efbb7ba52a114a' 
  AND token = 'J1z/Eq6xYp9YWe+IqftOtaQGaBfApuY8DsgABHvnAXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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