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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b55e2f384bb6541c55bd6e303ecbc25a17ce9c7749ccf643c83a5498f9811cb' 
  AND token = 'wyQ81NYU+bpcb3O3rOwZK6pGfPX9KBrbT4qyjk/tH4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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