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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7065e34bcabe757255ff45da42cf48d2104a35134947c34c9d6fb0118426125' 
  AND token = 'c2QbwLAnHZyeJlxbgVVJhTeF2Wvf9y6w70Y76qUbGXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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