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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ffc4d2932107d3a6f2644821ca8323679f999721a1333269edb7449d6882e7' 
  AND token = 'gD/6hbYdUlCxgFxXBGg5ERXi9VCHFQfpiNc34mNU3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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