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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0997cdd774c830befe6e2191ca0fbd9f4a79b52f69059d7ce0d52053e8aa4fe7' 
  AND token = '8qZMk0iWKbBigVzMO6M523fIB70JjWEEIdXYm8+u9HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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