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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6b7fc65c53ab9136b58cd806f722bd7c288a3d441c38f28423bafb4a542891' 
  AND token = 'phWh4SXJf64graUJXp6D+R7rS5dgxYufWFLVQJ+XVkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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