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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b20f433cc4954db5935de3a41069707755c2709c0252e8db73682ce0d8c8954' 
  AND token = 'SJVrUBZfDBy0u9HI6ilw3T5HO9Szfih32K9tMHzWmZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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