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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7904d16852360f8b4969381d6bbc735fc060b996ea979523d17fbe6756f319c8' 
  AND token = 'g3WmQ1NqkItqm/EqPFguj7cKZF7HAb9lfVq3H9nxNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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