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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe077e629278da236057723fef8c7c60796a5a0858fe65244f9b4ec6807e735d' 
  AND token = 'mcIQ1FGcX+XobPvZgMhixXkeaRTbrWeo+ok9Glpx/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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