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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0babc9f001f34e1c378d9ace9f9637bdc17e1df23f715e790319e87e189049b' 
  AND token = 'aicUAd8E2oPUvBL2o26QmIa5Yv3vB1LLEhVpGqlPISs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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