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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce460214711a84ddf46d2ba25d5c67aca0c0f33c4763feced619072247fb941c' 
  AND token = 'Jol7uTyD0BsQ75ZlZWq1hSigqk/Erol6SXT9F0gmylo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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