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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3524bd1c2e29398ee622581890b86f1743cc08caeceb478449c18c0910d68ee7' 
  AND token = 'uzqcvkBHqrXxNhjh3XjMhx04jmd8cjuNg0S1T5e0qKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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