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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715f14ec03aaef5ab0e873c8e38d056c965ea97c3a360ad8031155b1382c891c' 
  AND token = 'Etd71w2VoY9Jugg/XNavs859tJ6Uim5IWscPsiT9VGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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