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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6832af182c31f81cf679db7f40a12327d97d745bb280a37b7f595bbc78ee594' 
  AND token = 'mRYKg3hgDNIaOndkPcsCNN62SGe0g6USDVJb/2gyi4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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