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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a210f3397a20ceb89ba4375c126271179baba2f33d35c42e3ff907e7d6200983' 
  AND token = 'rLCNw5o4rqcdS1iKM2gCg0Zbko7k6x+4wG5QhFOkUH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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