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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb45bc1ca82fbca3db1f8ed05d35508688dfa2121d42df120c309e9891b0601b' 
  AND token = 'c7FYQ3wJPdcsos//abTQzVaj/K1VoqxUVlHAAhOO5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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