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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbb86d8687b7707ed018be3f4fdd01deed1b235c11668297949c9e0e108af78' 
  AND token = 'oqSMqcyODX4w6WPMSS9EgEDtUQhevoDmCi6fE2GfAmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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