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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85f0b2237debc4493fd55cf54b01fbf64a9cc9d9a74ec89c360a7dd72076908' 
  AND token = 'RouoShejZx3Tk/eAFf8C0zH9yG+Eg2tkLdKeab33Aqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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