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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca2c3b6646f66f022d55cb1ea4e98088ec75a2f23a6acb74e492a8fb773df96' 
  AND token = '7aRfCT2Pyxs3CfMGuVhMVFxcnsZlvZldF2P1uPfIRr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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