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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a21dda68db3e822ea1af420419e5d24783de03c58c35f619878e0ddd5f27bf' 
  AND token = 'ZR6nETdOJOYwPkoKvCwzBtJrngO1tNr1iwkxZDtUJLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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