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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b75f09ef19d036f59a277c7e3445f25170503ca99b82728ee83d84da78a27ee' 
  AND token = '0FPvBlQ2Ug4XhEuMbXFy3ROH+gBpGhy2tGz5/4OHS8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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