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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf74e8ef962b0faa92c8e4c6a70820db8a74f09814bdc9b23ce2ee0c7d783f8b' 
  AND token = 'vBIBTV1B+iAaTtQQYfv1Iz7bmHQBvoSdhUFFpzThLYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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