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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d9a968c221c8d745fa4ca9d68bb87cc41dad169233104b35e53d68d485dd24' 
  AND token = '/x0EWACL4DyjMg5awWGkymUNeGQ2PXxCbutIv7/oOZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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