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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e25fed87fa0b538d850d7ebb6e99fc16066deadf2e4a5fe8b4e84efe52e037c' 
  AND token = 'Hwl5Yb9dcF2PNYSazpjUEH3GxbPecXVqWiX3v4TF0qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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