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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ba2832d6a42e68b200508a2ba60cf744f310001d7a0c0b0da171eebb69b48e' 
  AND token = 'Snnksok+zWMuib1Svh5oLpgYYVqRLfjCnM1QcoW96ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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