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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14ef384c1df917221f6a6fb32098605c52f3ffd3d9c72432ac920de6794c5db' 
  AND token = 'BurDtDiNx+vD8vnXRm8CKBLjBgt7zdcouNBdukOg2sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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