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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001ecabe3d7098c01730e144ba73720a45459dde0514c71574c1c566c54e8e36' 
  AND token = 'fUylgT7F6d9G2xw4I68QB7pbsGe2Tvmzom3HPKkplrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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