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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4008c0d1482acc25485eddd990df4cf1cfc79ce1993460a6a1493df1497602a5' 
  AND token = 'u92abAiAn33ZIPMC+9OdiFanX/oFDy5diTa0Zhx/lH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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