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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e62717d37790cc6747c6c296607b8fd3263b0ca492c57c3f75c0f163b1373ba' 
  AND token = 'm4JF4ULx5545lBpeskdApXA31C/x3dn1c7QOBWBMGN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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