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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c01892d35a7295d0f7623c6b05aee9c1ccc5916cd7b726e0d83dc5b75fcf14' 
  AND token = '/KC0kDJePMzDhS8dO/fiMsh7DoXylHqpfILMQoC+1ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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