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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d8ca0ea1e9c86861fecba905dda8ec2afec75d561facee6d0635c79fdaafab' 
  AND token = 'Iu8FIk9OLAI3357I8R3GDOg0ccg2jOx9hzkQCd0cJn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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