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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f983fbc0178cd6bd02e25e568e59817540cc531beffe837b655ff14bbb9e0af3' 
  AND token = 'tM6C2ry1KQ1m/Rg8ilpgZB58nBAQn2dUbW9ROoI275o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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