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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c03a6fbd82f0051195253c357b3e140a0325f152fa00c0ddf0353e1eee1d50e' 
  AND token = 'MrKHSukuXnzdCYlGvX/0umtF1J/4GAqumr4dskD37ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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