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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6b65e6311a4cc7e35e26d2b681ecd8cc617e250e15da85adb96da30b3799e0' 
  AND token = 'IU6/CYzL47khG3dDKAuEtH3eXIP0NrvfPk/axspHAww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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