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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a670f321d447b0c7adaccb993f57740b8022d2f7542b8f2f320519a4acfaa6' 
  AND token = 'WCVJtSnepon5MrTp2T1BE1h5hvu3DoRDMhftkk8tLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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