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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2496cf179b164550b469bd985d110e856c055f78280056789e79d260a3ab798a' 
  AND token = 'RpBRA3NivEgDcYf//sYOzM2HnkSY8d/Gz/kcCofm3dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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