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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8428d5260cd67efa7b2037ea212154de0c801d59a7262419a7e5da85ca2ee1' 
  AND token = 'U5kVAqJmayJtYjHQxbxJJsBH0/uSEMPz9IfETvtoC18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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