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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf2e2a86f457efa4f07e6b3b5339079b1516873da9c0f70c497d252ea88dcf8' 
  AND token = 'ZnuNgUuQ7pBDhtzJoxum4Tl43rNbA8iGn9/EpRRrQ18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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