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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b87595ece9b3279150046dd203b08c5bacf824bbfe0264c37aac473ef34ff3f' 
  AND token = 'LRT0VZpexMDKe8wxRrlKwPxb84zLt7tcxj4Ic366FyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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