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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb160389d8f1968f8e3df5f83c2cf20c7523f0b5fb25d9013ae26e401a64dc0' 
  AND token = '2SZmpjW1gzPjrWBxOocHqDXe604D24X3U7clkDc9LyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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