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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293a026092c62952f70aa473ea5f7cbffb42a7bf2716a20a372509923d10ab2a' 
  AND token = 'i9+JXtmB9vyNU4GScSHW6fchAwJ+jwq4w99o6wRovsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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