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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed5f9d95d04eef97eb5110d13a13414aedfce0c2fc067bdca6c83d0cc303b58' 
  AND token = 'GNC77q4t6CrMuFp5wfsnuyIK9epT/Hie8jxVEwmlg7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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