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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4485a13a257d7739caf80213f91f31d0ea42c571f09b0710ce90e2008117e5e' 
  AND token = '5fg56NAuSz7Si6g1h/GTNmQR2Vi4cmowdczxH2hvpqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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