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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8613f9e67c09da470dc69ded978f0b6330b716f09fe3ae3ea0d0cedfb6241d1' 
  AND token = 'ndDQRP8oNZEbIlpn9MUa8eoX0oYkFrPFF+yMMhhmBB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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