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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc40e7727ecd1f3096f2e56d0b4c0bbbb332d1206f160163f8542ec7314babce' 
  AND token = '02R9JLIwktC/+yI4vV/GUEl/BAtOzhGnOHftpDluQuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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