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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca085ba6d62a8913fa949206e32bc986056be1535a766225e65d3b7343858719' 
  AND token = '/NlI4FIoQrf3jMPx2iy/KkWn9Wz6fO4LrZ9llgLkAM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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