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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbccc14b0cdb08451c0d4dc73875e4536d3d56c674eadd944128123f7f7c56c' 
  AND token = 'nrXSWJ9J5rSu69J2+hoAMgrAtrfuc9foxL33AroZ22Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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